paying interest on forex positions

This is a discussion on paying interest on forex positions within the Forex Brokers forums, part of the Commercial category; I'm just wondering whether all forex brokers charge their clients interest on their forex positions, and how much.
At IB, ...

I guess I'll have to add it to the slippage and the spread too when calculating my transaction costs.

What the jargon for this? Something like 'carry charge'?

If I start trading 1,000,000 then the rates get more appealing - interest earned remains the same but the interest paid goes down to base rate + 0.5%.

Actually I don't know how IB calculates it. I trade on hourly bars, so some of my trades are over quickly enough to make it negligible, but it depends if they take a snapshot of the account at end-of-day or if they work it out to the hour - or minute.

Interest carry or rollover based on the differential between the overnight interest rates of the two currencies in question is pretty standard practice for overnight holds. And lest you think you can avoid it trading futures, the carry there is factored into the price spread between the futures and the spot rate (which converge at expiration).

Overnight holds only? I guess that makes sense, it must be much easier to calculate in terms of the brokerage IT systems they have in place. I have to ask IB at what point in the day the interest charges are applied.